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No LEDs turn on when ESC gets power

My new ESCs don’t flash any LEDs at start-up or at other times. I’m trying to troubleshoot and wondering how to get LEDs to turn on so that they could help troubleshooting. There is power to the ESC and motors which do spin, but not always as I intend.

@picante There are no LED indicators on the R3 Basic ESCs, the LEDs were only on the R1 and R2 Basic ESCs which had a different hardware design.